drm/amd/display: Add Freesync HDMI support to DM with DMUB

[Why]
Changes in DM needed to support Freesync HDMI on DMUB.

[How]
Change implementation to parse CEA blocks in case of DMUB-enabled ASICs.

Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>